Boring or penetrating the earth – Below-ground impact members – Resiliently biased
Patent
1980-01-31
1982-06-08
Pate, III, William F.
Boring or penetrating the earth
Below-ground impact members
Resiliently biased
175302, E21B 406
Patent
active
043335420
ABSTRACT:
A downhole fishing jar mechanism for freeing stuck objects within a well bore which incorporates a housing structure defining an internal anvil element through which an upwardly-directly impact force is adapted to be transmitted to the body structure. A striker element, incorporated with an elongated operator element is adapted to strike the anvil with an impact force that is controlled by means of an adjustable compression spring. A spherical detente-type latching mechanism is adapted to establish a releasable interconnection with the operator element and further is operative to transmit the compression of the spring to the operator element. The latch mechanism releases automatically upon predetermined upward movement of the operator element and latch mechanism within the body structure, thereby allowing the operator element to move upwardly and cause the striker to impart a predetermined impact force to the anvil. The latch mechanism is capable of being automatically reset upon simple downward movement of the operator element, thus promoting repetitive jarring simply by controlled upward and downward movement of the operator element through actuation of surface-controlled equipment.
REFERENCES:
patent: 1989906 (1935-02-01), Beck
patent: 2122751 (1938-07-01), Phipps
patent: 2166299 (1937-07-01), Kennedy et al.
patent: 2634102 (1953-04-01), Howard
patent: 2882018 (1959-04-01), Andrews
patent: 3880249 (1975-04-01), Anderson
Matthews Guy E.
Pate III William F.
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